Figure 1

The evolution of domain sizes for RNAase family (cd00163) as inferred from the overall spacer lengths. The phylogenetic trees were constructed using neighbor-joining method and the sum of spacer lengths from all family members were mapped to the external nodes of the trees. Values for internal nodes were inferred using model #2 and the branches associated with the bootstrap values larger than 50 are shown as thick lines. At the bottom the overall spacer lengths are plotted versus the evolutionary distance (measured in number of amino acid substitutions per site) from the root to a given external/internal node. This is an example of positive significant correlation with the correlation coefficient of 0.57. Dashed line shows the approximation of the data by linear regression model.